Indeed. The BBC’s Domesday book was put on a pre-CD glass based optical medium which should last forever, but they managed to lose reading equipment for it, and a huge digitization effort from the 80s would have been lost (they published a call for help, and eventually someone found a reader in their garage.... but it was a close call)

Yeah I see online empirical data that shows anywhere from years to centuries, depending on temperature. So not thousands of years.